Pneumatically-operated chain saw.



C. J. OLSON.

PNEUMATICALLY OPERATED CHAIN SAW.

APPLICATION FILED JAN. 1. m3. RENEWED AUG. 17. 1911.

Patented Mar. 26, 1918.

LQEOI? 01.

oooo CHARLES J". OLSON, 0F MUSEGON, mcmenn.

PNEUMATICALLY-OPERATED CHAIN SAW.

vApplication filed January 7,

J. Orson, residing at This invention relates to pneumatically" operatedchain saws and is designed more particularly as an improvement on thechain saw forming the subject matter of my copending application SerialNo. 7 00,264, filed May 28, 1912.

It is the aim of the present invention to provide in a device of theclass described a novel arrangement of the motors for driving the chainsaw both as regards relation of the motors to the saw and the relativepositions of the motors and the handle which is grasped in supportingthe device, the arrangement being such as to secure a balanced structureand thereby prevent overturning of the device while in use.

In the accompanying drawings:

Figure 1 is a viewv partly inside elevation and partly in verticalsection of the improved device, portions being removed to betterillustrate the structure;

Fig. 2 is a top plan view of the handle and of the device.

Corresponding and like parts are referred to in the followlngdescription and indicated in all the views of the accompanying drawingsby the same reference characters. In the'drawings the power shaft of thesaw or, more generally speaking, the motor shaft, 1s indicated by thereference numeral 1 and as will be presently made apparent supports thedrive sprocket of the saw and the compressed air motors which operate torotate the shaft. The sprocket mentioned is identical inconstructionwith that shown in my aforesaid copending a plication and is indicatedin general by t e numeral 2,

this sprocket being located between the two motors which are indicatedin general one the reference character A and the other.

y by the reference character B.

- The stock of the saw is supported at one endbetween the casings of thecompressed air motors in the manner shown in Fig.2 of thedrawings andthis stock consists of a plate 3 and cheek plates 4 which are riveted orotherwise secured upon opposite faces of the plate 3. The chainsawproper consist- Speciflcation of Letters Patent.

Patented Mar. eaters.

1913, Serial No. 740,695. Renewed August 17, 1917. Serial No. 186,827.

ing of connected links 6 which are of the same construction as shown inthecopending case, is trained over the sprocket 2 and another'sprocket 2located at the forward end of the stock.

The handle of the saw is indicated in general by the reference numeral 7and is provided with a relatively wide head 8 the forward side of whichis concave and arranged for the disposal thereagainst of the motorcasings A and B, these casings being held securely against the forwardside of the head 8 by means of screws 9 as shown in' Fig. 2 of thedrawings. The motors A. and B may be of any ordinary compressed air typeor may be operated by any other mo- .tive power and as they themselvesconstitute no part of the present invention it is not considerednecessary to specifically illustrate or describe their structure. Byreference to Fig. 2 of the drawings it will be observed that the motorcasings are located at o poside sides of the stock upon which the c ainsaw is mounted for travel and that the said stock is locatedsubstantially in a plane in front to rear alinement with the axis of thehandle 7 and that by reason of this relative arrangement of the parts awell balanced structure is produced and there is no likelihood of thedevice overturning while in use. Furthermore, it will be observed thatthe motor casings are firmly secured and snugly received within theconcavity of the head 8 of the handle and that the said head serves as ahand shield at the rear end of the saw proper.

Having thus described the invention what is claimed as new is 1. In achain gay? machine, a handle, a relatively broad'head carried therebyand havmg a concave forward side, spaced motors mounted for travel uponthe stock and geared with the said shaft.

2. In a chain saw machine, a handle, a relatively broad head carriedthereby and having a concave forward side, spaced motors having theircasings dis osed within the concavity of the head an secured to andsupported by the said head, the adjacent constituting also a guard forthe chain saw heads of the motor casings having bracket lying in frontof the grip of the handle. l

portions, 3. stock secured between and sup- In testimony whereof I aflixmy signature ported by the said bracket portions, and a inpresence oftwo witnesses. chain saw mounted for travel upon the stock CHARLES J.OLSON. [L. s.] and driven by the said motors, the stock Witnesses:

extending substantially in alinement with LEO CUDDAHY,

the handle and the said head of the handle FRANK E. HA'rnAwAY.

